package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.JwtClaimsConstant;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.JwtProperties;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.JwtUtil;
import com.sky.vo.UserLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    private static final String wechatUrl = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    WeChatProperties weChatProperties;

    @Autowired
    UserMapper userMapper;

    @Autowired
    JwtProperties jwtProperties;

    @Override
    @Transactional
    public UserLoginVO login(UserLoginDTO userLoginDTO) {
        // 向微信服务端发送请求
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(wechatUrl, map);

        // 获取 openId
        JSONObject jsonObject = JSONObject.parseObject(json);
        String openid = jsonObject.getString("openid");

        // openId 请求失败
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 根据openid查询用户信息
        User user = userMapper.getByOpenId(openid);

        // 如果 user 为空则为新用户
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
            log.info("新建用户 id: {}", user.getId());
        }

        // 用户id
        Long id = user.getId();

        // 获取token
        Map<String, Object> claims = new HashMap<>();
        claims.put(JwtClaimsConstant.USER_ID, user.getId());
        String token = JwtUtil.createJWT(jwtProperties.getUserSecretKey(), jwtProperties.getUserTtl(), claims);
        System.out.println(token);
        return new UserLoginVO(id, openid, token);
    }
}
